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A critical Windows Netlogon remote code execution flaw, tracked as CVE-2026-41089, is being actively exploited against corporate networks, with attacks targeting Windows Server domain controllers. The vulnerability can be triggered through specially crafted Netlogon requests without authentication or user interaction, potentially allowing attackers to run arbitrary code with SYSTEM-level privileges and escalate to full domain compromise.
Microsoft patched the issue in its May 2026 Patch Tuesday release, which addressed 118 vulnerabilities, including 16 critical flaws, and the Centre for Cybersecurity Belgium flagged the Netlogon bug as a priority because of confirmed in-the-wild exploitation. Organizations are being urged to immediately patch supported Windows Server versions from 2012 onward, restrict domain controllers from untrusted network exposure, and increase monitoring for suspicious Netlogon and authentication activity while reinforcing segmentation and access controls around domain controllers.
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3 events from the most recent confirmed update back to the earliest known activity.
The Centre for Cybersecurity Belgium identified CVE-2026-41089 as a priority issue and confirmed that the Windows Netlogon flaw is being actively exploited in the wild. The vulnerability affects Windows Server domain controllers and can enable unauthenticated remote code execution with SYSTEM-level privileges.
Microsoft disclosed and patched the critical Windows Netlogon remote code execution vulnerability CVE-2026-41089 in its May 2026 Patch Tuesday release. The release reportedly addressed 118 vulnerabilities, including 16 critical issues.
Acros Security released micropatches for legacy Windows Server 2008 R2, 2012, and 2012 R2 systems to address CVE-2026-41089. The micropatches were presented as an option for older server versions alongside Microsoft's Patch Tuesday fixes for supported systems.
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A critical vulnerability in the Windows SMB client, tracked as CVE-2025-33073, is being actively exploited by threat actors months after Microsoft released a patch. The flaw, which affects Windows 10, Windows 11 (up to version 24H2), and all supported versions of Windows Server, was initially addressed in Microsoft's June 2025 Patch Tuesday update. The vulnerability allows attackers to escalate privileges to SYSTEM level by coercing a victim machine to connect to a malicious SMB server, where the protocol can be compromised. Attackers can exploit this by executing a specially crafted script or convincing users to run such a script, leading to authentication with the attacker's server and subsequent compromise. Security researchers from organizations including CrowdStrike, Synacktiv, GuidePoint Security, BNP Paribas, SySS GmbH, RedTeam Pentesting GmbH, and Google Project Zero contributed to the discovery and public disclosure of the flaw. Some researchers have highlighted that the vulnerability bypasses NTLM reflection mitigations and can be used for authenticated remote command execution, not just privilege escalation as initially described by Microsoft. Technical details and proof-of-concept exploits have been published, increasing the risk of widespread exploitation. The Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2025-33073 to its Known Exploited Vulnerabilities (KEV) catalog on October 20, 2025, confirming active exploitation in the wild. CISA has mandated that all US federal civilian agencies apply the patch or remove vulnerable systems from operation by November 10, 2025, under Binding Operational Directive 22-01. While this directive is specific to federal agencies, CISA has strongly urged all organizations to remediate the vulnerability immediately due to the ongoing attacks. The vulnerability was publicly disclosed at the time of patch release, but exploitation was not observed until months later, underscoring the importance of timely patch management. Microsoft has not yet issued a public statement regarding the active exploitation. The flaw's ability to bypass existing mitigations and enable remote command execution makes it particularly dangerous for enterprise environments. Organizations that have not yet applied the June 2025 patch remain at significant risk of compromise. The ongoing exploitation highlights the persistent threat posed by delayed patching and the rapid weaponization of disclosed vulnerabilities. Security teams are advised to prioritize remediation and monitor for signs of exploitation related to CVE-2025-33073.
Jun 29, 2026
Microsoft disclosed and patched several Windows elevation-of-privilege vulnerabilities affecting networking-related components, including **Windows Remote Access Connection Manager**, **Windows SMB Server**, and **Network Connection Status Indicator (NCSI)**. The issues tracked as `CVE-2025-62474`, `CVE-2025-62472`, `CVE-2025-47955`, `CVE-2025-59201`, and `CVE-2025-58726` could allow attackers with limited access to gain higher privileges on targeted systems, extending a pattern of privilege-escalation risk previously seen in the same Remote Access Connection Manager component with `CVE-2022-21914`. Among the disclosed flaws, Microsoft provided additional detail for **`CVE-2025-58726`**, describing an **Important** improper access control issue in **Windows SMB Server** that can let an authorized low-privilege attacker elevate to **SYSTEM** over the network by coercing a victim machine to authenticate to an attacker-controlled SMB server using a specially crafted script. Microsoft assigned the bug **CWE-284** and a **CVSS v3.1 score of 7.5**, said exploitation required specific conditions involving an unused or nonexistent Service Principal Name on the target, and stated that the vulnerability was neither publicly disclosed nor exploited in the wild at publication and that a security fix was available.
Jun 29, 2026
Microsoft confirmed that **CVE-2026-32202**, a patched Windows Shell spoofing flaw, has been actively exploited in the wild after initially publishing incorrect exploitability information. The vulnerability is a **zero-click authentication coercion issue** tied to an incomplete fix for **CVE-2026-21510** and can be triggered when Windows Explorer processes a malicious `.LNK` file. Researchers said the shortcut’s crafted `LinkTargetIDList` can force the system to resolve an attacker-controlled UNC path, causing an outbound SMB connection and NTLM authentication attempt before SmartScreen trust checks occur. Akamai and CERT-UA linked the activity to **APT28**, which used weaponized LNK files in campaigns against Ukraine and several EU countries beginning in December 2025, chaining **CVE-2026-21513** with **CVE-2026-21510** for code execution and then abusing the residual flaw to capture **Net-NTLMv2** hashes for relay attacks or offline cracking. Microsoft addressed **CVE-2026-32202** in its April 2026 Patch Tuesday release, and defenders were urged to patch quickly, monitor outbound SMB traffic, and reduce or harden NTLM usage to limit follow-on credential abuse.
Jun 29, 2026